It's important to remember that many of our antagonists have been fed a pack of falsehoods, lightly seasoned with truth. They have grown up and grown strong on all this stuff. It is a HUGE change in world-view and in habits of mind even only to entertain provisionally that there might be something to what we say.
I've been there.
One reads the passage like a hound, sniffing for any matter out of which one might spin a charge of Pelagianism or semi-Pelagianism, and finding something which MIGHT be so spun, they pounce and shake it like the rat they think it is.
After all, if it were true that we corrupt the Gospel as they say we do, that would be a very bad thing, so bad that lacking faith in God, one might also throw reason, prudence, courtesy, and thoughtfulness overboard in one's haste and urgency.
So our job is to be patient and truthful, as God gives us the grace to be so.
"The Lord will fight for you, and you have only to be still." Ex 14:14
Unlike the practice (dare I say "tradition") on the Forum, I used the word lie to describe the content, not the motivation. Lying, as defined by St. Thomas Aquinas, is a statement at variance with the mind. That definition applies equally to the teller and the audience. A lie, whether representing something that is false as true or something that is true as false, is simply a falsehood. It is not necessary that one has to know something to be false for it to be a lie.